1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3203fe382e61357c58e99897f43aaa1eca02034caa603158725f838a6f38275. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4ba2e20-5d00-4d42-bd6c-cba531ae6071.json and https://artists.proofprofile.net/proofs/artist/c4ba2e20-5d00-4d42-bd6c-cba531ae6071.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0fc089e3779f7f43f875f49f3a0b25f63aa95aaa6a3e44dacb94f26f7816b0. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES72575687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351a1f9afc4b7b4a264c553bb24d48664360bdfc887df6265932f991153bf731. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52529898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2459253ae6b2864ac4f53297b6bf949edcab607aaabe5ca5777af52c0392f47. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6G2594238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351a1f9afc4b7b4a264c553bb24d48664360bdfc887df6265932f991153bf731. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52529898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe4de69908ecd2e45ba353577d6032778b520ac52ef6a8924ef3eb02b4cfc6a. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:04:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN72561290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd667e084eeb89e709727e63ff01431ef7acf9a524183ed0ea02037acc30b72. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T06:36:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6G2594239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b8681e7ea1a67bab7672d2a5fda5cfe8ad5b1751c25d1bdc091f0f523cd244. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6G2594240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2eb35c9dfa90460e7876c8c340995367e9a0d212b1f1b8979fbf3ef1a404a5. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:04:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6G2594241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57073cb19bf909b253e7a5e5279531871f9864d36c04a85ebe15baac4b536a93. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6G2594242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f264822cd0ccca5a420ecd08024625a619ac8947df3213ce2f37b37c3e064e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1906496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14170df25ba9a59349ae1951ef0a31972a1c7000b81d11753c6f569f999cb8a1. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1906468.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch